Injector apparatus



Nov 20, 1951 E; WILLIAMS x-:rAL

INJECTOR APPARATUS 2 SHEETS-Smm 1 Filed May l, 1950 N0V- 20, 1951 E. WILLIAMS Erm. 2,575,646

. INJECTOR APPARAT'US Filed May l, 1950 2 SHEETS-SHEET 2 Patented Nov. 20, 1951 ,INJEGT-QR APPARATUS 'Ernest-Williams and'BruccWhitehcamllunbridge Wells, andJohnfPcrcy Mex'ccx',l 'Tonbridge England, assignors tofE. C. D. Limited, Tonbridge, England, a, company' of GreatBl-'itain ApplicationMayll, 1950,1SerialNo;.159,158 .I n Qreatritain May-1,210,519@

8^Glaims.

l This invention relates to injector apparatus and more Aparticularly to control rapparatus y'for use in the control of pumps for addingsmeasured proportions of one substance to another. Such vappara-tus is often required for a variety of purposes for example for addingl chlorine to water,

for adding certain so-called inhibitingfchemicals to oil inA oil refining and for adding ce1-'taincom.- ponent fluids to other fluids-in scentmaking` :Tn these vand other cases it is required toaddfcertain substances to others'so as always to mai-n.- tain predetermined proportions of=the1added sub!- stances to those to whichthej7 areadded.

Itiscommon practice in injector yapparat-us:of

this nature to inject a substance to be "addedpby I means of a variable injector" device, such, for `ex ample, as a variablesthrow pump, thedeliveryof which isv automatically governed in dependence upon the rate of flow of the mainy substance-to which the addition is to be made. .In general Athere is provided a devioeresponsive `totherate of'ow of the main substance-Fee. aventurierpressurehead-which controls apressureror vaca uum cylinder, bellows, or thelike, whichn turn controls. directly or indirectly the-throw of the injector pumpor produces an equivalenticontrol,

on the rate of delivery of the addedzliquid;

This invention relates to injector automatic control apparatus of the kindk inwhich ,a varialiiilcA delivery device. is automatically controlledto vary its rateof delivery as a func-tion of the rente .of I

now of aniain substance to. which said `device is required tomake addition. Theinventionlha' for itsobjectto provide improved automatic cons trol apparatus ofthis kind which shall ber 'mp1s and cheap to make, easy to adjust. economic to maintain and capable of being operated-:and adiusted satisfactorily by relati-velyunskilled-labour suchas: native labour.

The invention is illustrated in ,the accompanyine drawings in which-Fig. l afsecticrialelevaition through the unit in association with a 'fragment of a reciprocating pump in elevation, and Fig. Zisasectional planonthe line 2--2 of Fig. l oone embodiment.

Referring to the drawings these show a simple automatic control unit foroontrolling a variable throw diaphragm or other reciprocating pump P as well known per se which injects chlorinated uid into a water main (not shown) under the control of the flow in said main. The control unit comprises a control device in the form of a pressure cylinder I and piston 2. The cylinder I is subjected through a pipe Ia to pressure derived from the water main from a restriction (not shown) therein so that the greater the rate cylinder; length .vertical and contains the piston 2 which otwater `flow the greater the pressure inthe The said cylinder is mountedv with. its

isxmoved vertically upwards by pressure in the lcylinilen 4nlthe piston rod 3 .is a cam plate 'd in which is a slot 5 in which is slidablyfmounte'd an operating rod bearing 6 which is carried 'by an Voperating rod 1 which is slidable endwise in bearings-,f8 and' which controls the throw of the pump. Thexcontrol-may be eiected directly'by connecting the throw-varying lever (not shown) ofthe pump-to the coupling 9 on the end of the rod I .or any suitable. electrical or hydraulicfor vother servo :or relay mechanism as well known .per-se may be yinterposed between thecoupling ll''-anclwthe.throw--varying` lever of the pump. As will'befapparentfas the cam plate 4. is moved up and down bythe piston rod` 3 it movesthe rod 'I endwlse thusy varying the stroke ofv the pump.

vThe cam plate 4* is pivoted at I0 so-that the angle ofthe cam slot 5 with respect to the axis of the `piston-.rodean be adjusted andthev totalxmove- `men-t-olthe'rod 1 thus. adjusted. A grub screw aty I I locks the plate 4 in the chosen adjustment andra-apointeriIlin conjunction witha scale I3 indicateszpthe adjustment chosen. Also mounted onrthe piston-'rod 3 above the operating rod 'I is a striker' disc I4y which is fixed on the rod'at right angles. thereto and may, if desired, be arranged-.to be adjustable in position'along it. As .shown the :disc VUlis not adjustable, Above the :striker-.disc arettwo xecl discs I5,l I6 which are parallelfto 'onek another Vand to the striker disc amdV are, held in.xedfrelationship by boltsand spacers atk IJ.. These discs l5', I6 are provided :with :a v.corresponding number of holes so ar- .ranged'thateach hole in one li-xedv disc is ver tica-llyLin line kwith one in the other. Qnly two oirtheseihoies, I8, I9, one n Veach disc appeal* infie. .1.; butitrwill,beundeistood that there are severalsofzdiierentsizes, iny each disc. Weights such-as 29, Zlin the form of rods of diierent .lengths and with enlarged heads or collars. 2 2. 23 are loosely fitted in the holes in theflxeddiscs, `thefheads or `collars being ktoo large tofpass the holes. Eaohiweight; has-its head. above the upper balanced by counterbalancing weights 24" attached through wires 25 running over pulleys 2B,

to a bridge piece 2'! forming part of the pistonj;

rod structure.

The main advantage of the invention lies in its mechanical simplicity and reliability, VMathematically complex laws can be readily satisfied without the use of springs requiring careful adjustment and maintenance and without the use of expensive and awkward cam shapes. Moreover, maintenance is easy, and does not require highly skilled labour. In addition troubles vdue to'mechanical friction are so reduced as to be negligible since the weights such as 2S and 2i are quite loose tting and have merely to be guided as they lift.

We claim: i

l. In an injector apparatus of the kind in which a variable delivery device is automatically controlled to vary its rate of delivery as a function of the rate of flow of a main substance to which said device is required to make addition, a control device comprising a pressure responsive member responsive to pressure developed in dependence upon said rate of iiow of said main substance, an upwardly movable member connected to said pressure responsive member to be moved upwards thereby, a plurality of separate exchangeable weights in the upwards path of said upwardly movable member and positioned to be sequentially engaged thereby, and a control operating member driven by said upwardly movable member 'for automatically controlling said delivery device.

2. In an injector apparatus of the kind in which a variable delivery device is automatically controlled to vary its rate of delivery as a function of the rate of flow of a main substance to which said device is required to make addition, a control device comprising a pressure responsive member responsive to pressure developed in dependence upon said rate of flow of said main substance, an upwardly movable member connected to said pressure responsive member to be moved upwards thereby, a plurality of separate exchangeable weights in the form of vertical rods each freely mounted for vertical movement above a datum position, said rods being mounted with their lower ends in the upwards path of said upwardly movable member and positioned to be sequentially engaged thereby, and a, control operating member driven by said upwardly movable member for automatically controlling saiddelivery device.

3. Apparatus as claimed in claim 2 wherein the rods are carried in a carrier frame comprising two horizontal vertically spaced frame members with vertically aligned holes in which said rods are loosely mounted, each rod having an enlargement of greater diameter than the upper of the two holes in which it is mounted.

4. In an injector apparatus of the kind in which a variable delivery device is automatically 4controlled to vary its rate of delivery as a function of the rate of flow of a main substance to which said device is required to make addition,

a control device comprising a pressure responsive member responsive to pressure developed in dependence upon said rate of iiow of said main l substance, an upwardly movable member connected to said pressure responsive member to be moved upwards thereby, a plurality of separate exchangeable weights in the upwards path of said upwardly movable member and positioned to be sequentially engaged thereby, and a control operating member driven by said upwardly movable member for automatically controlling said delivery device said upwardly moving member Vhaving an inclined cam slot in which is a bearing carried by said control member which is mounted to be movable endwise and horizontally.

5. In an injector apparatus of the kind in which a variable delivery device is automatically controlled to vary its rate of delivery as a function of the rate of flow of a main substance to which said device is required to make addition. a control device comprising a pressure responsive member responsive to pressure developed in dependence upon said rate of flow of said main substance, an upwardly movable member connected to said pressure responsive member to be moved upwards thereby, a plurality of separate exchangeable weights in the form of vertical rods each freely mounted for vertical movement above a datum position, said rods being mounted with their lower ends in the upwards path of said upwardly movable member and positioned to be sequentially engaged thereby, and a control op-` erating member driven by said upwardly movable member for automatically controlling said delivery device said upwardly moving member having an inclined cam slot in which is a bearing carried by said control member which is mounted to be movable endwise and horizontally.

6. Apparatus as claimed in claim 4 wherein the-inclination of the cam slot is adjustable.

7,. Apparatus as claimed in claim 5 wherein the inclination of the cam slot is adjustable.

8. Apparatus as claimed in claim 2 wherein the rods are carried in a carrier frame comprising two horizontal vertically spaced frame members constituted by iiXed horizontal discs with vertically aligned holes in which said rods are loosely mounted, each rod having an enlargement of greater diameter than the upper of the two holes in which it is mounted said upwardly movable member comprising a horizontal dise for sequentially engaging the lower ends of said rods.'

ERNEST WILLIAMS. BRUCE WHITEHEAD. JOHN PERCY MERCER.

No references cited.

Arx 

